下列物质中，前者属于化合物，后者属于单质的是（　　）

A．净化后的空气、二氧化碳

B．氧化铁、啤酒

C．生锈的铁钉、高锰酸钾加热后的混合物

D．冰水、液氧

— I _______ James this evening and ask her to come to my party.

— Don’t phone her between 6 and 7 o’clock. She _______ a bath.

A．am about to call; will behaving

B．am going to call; is having

C．am about to call; is having

D．am going to call; will be having